1. S. Erfani and M. Ahmadi, Direct form realization of 2-D digital systems, Internal Report, University of Windsor (1986).
2. A. Fettweis, Digital filter structures related to classical filter networks, Arch. Elektron. Uebertragungstech.
25, 79–89 (1971).
3. A. Fettweis, Some principles of designing digital filters imitating classical filter structures, IEEE Trans. Circuit Theory
CT-18, 314–316 (1971).
4. J. Bingham, A new type of digital filter with a reciprocal ladder configuration, IEEE Symp. on Circuit Theory, 129-130 (December 1970).
5. A. Chu and R. E. Crochiere, Comments and experimental results on optimal digital ladder structures, IEEE Trans. Audio Electroacoust.
AU-20, 217–218 (1972).